Shares of MicroStrategy (MSTR) fell as much as 12% on Tuesday after the company said that it plans to raise an additional $400 million in institutional debt to buy more bitcoin. Investors clearly weren't enthusiastic about the new strategy to borrow debt to buy bitcoin, as one Citi analyst, Tyler Radke, told the Motley Fool that they downgraded the company's stock from neutral to sell as they believe  taking on debt to double-down on Bitcoin makes the company a much riskier investment. Other analysts on Twitter pointed out hat MicroStrategy's shares are up by 110% this year, and he's playing with house money. MicroStrategy CEO Michael Saylor says he personally holds 18,000 BTC and expects a 100X return in years to come. "Bitcoin is a swarm of cyber hornets serving the goddess of wisdom, feeding on the fire of truth, exponentially growing ever smarter, faster, and stronger behind a wall of encrypted energy," Saylor tweeted and pinned to his profile. When looking at Ethereum as an alternative investment to Bitcoin, he said "it didn’t compare," saying Bitcoin is a "crypto-asset" while Ethereum is a "crypto-application", and pointed to Bitcoin's 90% market dominance as evidence of it being the clear winner. He also points out that it only takes about 10 billionaires to triple the price of bitcoin. Saylor is already in the crypto history books for sparking a revolution from major industries to invest in Bitcoin, and it seems like he's not done writing his legacy.